Specifying a gas injection profile

A gas injection profile is used to specify the rate of gas injection during the pressure phase.

Note: Make sure you have selected the Gas-assisted injection molding process (Home tab > Molding Process Setup panel > Gas-Assisted Injection Molding).

1. Set a gas injection entrance by selecting the Set Gas Entrance icon in the Study Tasks pane, then selecting the node at which the gas will be injected.
   Note: Alternatively, click (Boundary Conditions tab > Gas panel > Set Entrances)

   The Set Gas entrance dialog is displayed.

2. To edit the gas entrance properties, select Edit in the Set Gas entrance dialog. You can edit the properties of an existing gas entrance by right-clicking on the gas entrance and selecting Properties.

   The Gas entrance dialog is displayed.

3. Select Edit to display the Gas-assisted injection controller dialog.
   Note: If you have more than one gas entrance, and you do not want all existing gas entrances to use the same settings, deselect the Apply to all entities that share this property checkbox.
4. You can choose to control the gas injection by using the gas pressure controller or the gas volume controller from the drop down list.
5. Click Edit controller settings to display the dialog for the controller you selected. Enter your profile.

   If you selected gas pressure controller you need to enter absolute values in the profile table.

   If you selected gas volume controller you need to enter percentage (relative) values in the profile table. You will also need to enter the following values:

   • Gas injection time
   • Maximum gas pressure
   • Plunger travel time
   • Initial pressure
   • Piston volume
   • Gas-line volume
6. Select OK to return to the Gas-assisted injection controller dialog, then OK to return to the Gas entrance dialog, then select OK to accept the new settings and return to the model.